Automatic electric braking.



No. 834,336. PATENTBD OCT. 30, I906.

, Y L. H. TIHULLEN. AUTOMATIC ELECTRIC BRAKING.

APPLICATION FILED DEO.22,1903.

2 SHEETS-S11E21 1.

I citizen of the United trio Braking,

- UNITED {STATE-S PATENT OFFICE.

LOUIS H. 'IHULLEN, OF EDGEWOOD. PENNSYLVANIA, ASSIGNOR TO" THE UNIONSWITCH 85 SIGNAL 00., OF SWISSVALE. PENNSYLVANIA, A OOR 'PORATION OFPENNSYLVANI AUTOMATIC ELECTRIC BRAKING.

Specification of Letters Patent.

Patented Oct; 30, 1906.

Application filed December 22, 1903. Serial No. 186,184.

Be it known that I, Louis H. THULLEN, a

States, residing at Edgewood, in the county of Allegheny and State ofPennsylvania, have invented certain newand useful Improvements inAutomatic Elecof which the following is a specification.

My invention relates to the braking of a car or cars on which anelectric motor or motors are mounted, and particularly, to an automaticbraking action of such a car or cars. I will describe a car equippedwith an ap.

paratus embodying my invention and then point out the novel featuresthereof in claims.

In the accompanyingdrawings, Figure 1 is a view of a car equipped withan apparatus embodying my invention. F ig. 2 is a diagrammatic' view:showing. some circuits required for the apparatus of Fig. 1. a viewillustrating a modification. a view showing aniodification of device. I3; 1

Similar characters reference I designate corresiponding parts all of thefigures.

A esignates an arbitrary representation ofa car, and A I of a motor, thearmature of whic is suitably geared with an axleor aXlesof the cariii-or- Fig. 3 is Fig. 4 is a' setting der that the car may be propelledalong a railroad-track.

A designates .'a suitable conductorv by means'of which electric currentfrom a line conductor B is led to the current from the motor may bethrough the trackrails, a separate conductor, or

through the ground. The electric current tion 01' the controller B, butwhen operated,

as hereinafter explained, it will cut oil the current from the motor andclose a circuit on the. motor to have it act as a dynamo, and the powerre uired to o eratethe motor when run as a ynamo will put a braking action on the car or train.

an j arbitrary re 'rc sentationa suitable form of con troller B, carriedby the car. The return for This" The current gener ated by the motorwhen operated as a dyiiamo may be.

8. The two arms b b are so arranged that when i one arm I) is inengagement with its series of contacts the arm 6 is out of engagementwith its s'eriesof contacts. The two arms may be alternately engaged byrockingthe lever on its pivot through the arm-b The-ordinary p0.-

.sition of the T-shaped lever is such that the arm 1). is in engagementwith itsseries of contacts, so that when the controller B is operatedcurrent will flow through wire 9, contact'5, arm I), contact 6,: wires10 and 11,

through armature of motor, wire 12, contact 8, arm 6, contact 7, throughwiresl3 and 14, through the field of the motor to ground. l

The arm I) is provided with insulation, so that there will be no'shortcircuit of the current from contact 6 to contact 7 throu h the arm. Thearm I) is insulation to prevent a short circuit through the arm fromcontact 2 to 3.

When the T- shaped lever is rocked to move the arm I) out ofitsengagement with its series of contacts, current will be cut off fromthe motor, the arm I) is moved into engagement with its series ofcontacts toclose a circuit on the motor. of the armature is as. follows:wires 11 and 15, resistance A, wire 16, contact 1, arm I) contact 2,wires 17 and 14, through the field contact '4, arm 1), conof the motor,wire. 18,

and-

This circuit starting from one brush similarly provide with.

tact3, and wires 19 and 20, back to the armature. Shouldthere be anymomentum of the car at the time of operating the T-shaped be made to actas a lever, the motor .woul generator, and the current a braking actionon the armature, and hence the car. Prefierabl the resistance A will becut outof the. closed generated will put circuit after a time, and

thisymay-be accomplished in any desired 10o may be a art of the switch13*.

manner and by any desired means. In Fig. 3 I have shown a means wherebythe resist- .ance A may be cut out of the closed circuit.

E designates a pivoted lever acting as a switch which is included in thecircuit which is closed on the motor A and which when free to movegradually cuts out the resisttion or trip C, located near therailroadtrack. This rejection or trip may be moved into and out of anyoperative position by any desired means, and the means may be controlledin any desired manner. For example, the projection or trip (3 may beoperatively connected with a signal mechanism. r In Fig. ,4 I have showna modification in the means for operating the switch B In this form anelectromagnet Y is substituted for the trip C. The current for theelectro magnet may be controlled in any desired way. An armature Giscarried by a toggle arrangement of levers Z, one of which levers Insteadof two arms l) but one arm need be used for this arrangement, as theseries of contacts are op osite each other instead of being arrange asshown in Figs. 1 and 2.

Many changes may be made in the relative arrangement andthe-construction of the p arts Without departing from the spirit of myinvention.

What I claim as my invention is 1. In combination with a motor carriedby a car, and having its armature geared with an axle of the car, acircuit including the an mature and field of the motor which is normallyopen, a switch for closing said circuit and means located along arailway-track for operating the switch to close said circuit.

2. In combination with a motor carried by a car, and having its armaturegeared with an axle of the car, a circuit including the armature andfield of the motor, which is normally open, a switch for closing saidcircuit, and an automatically-operated means located along arailway-track, engaging said switch whereby'it is moved to close saidcircuit.

3. In combination with a motor carried b a car, and having'its armaturegeared with an axle of the car, a feed-circuit for the motor, a secondcircuit including the armature and field of the motor which is norm allyopen, a doubleecting switch for said circuits, and means located along arailway-track for operating the switch.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

LOUIS H. THULLEN.

